<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Title</title>
</head>
<body>

</body>
<script>
	
	function fn1() {
		console.log(1);
	}
	function fn2() {
		console.log(2);
	}
	// fn1.call(fn2);// 1 调用fn1,并将fn1中的this指向为fn2
	fn1.call.call(fn2);// 调用fn1.call,并将fn1.call中的this指向为fn2
	
</script>
</html>